To reiterate what Daryl said:
If you veneer a panel - do the same thing to BOTH sides of the panel.
Otherwise you'll have unequal stress on each face of the panel and some sort
of bowing, curling, twisting is inevitable.
When I veneer I always have some "cheaper" quality veneer handy to do the
back sides of panels. Just as long as it's the same relative thickness and I
glue it the same way (same glue type) and with same grain orientation.
One thing you'll note on plywood - it's almost always made up of an ODD
number of sheets of veneers - that's to balance out the stress in the panel.
On a side note: Jatoba is pretty cheap around here (less than 4 bucks a
foot). Unless it's a highly figured piece of wood and all you're looking for
is a 1/4" piece - why not just use solid wood? Veneering and resawing is
best saved for rarer woods and figured woods you want to get more out of or
do things like bookmatches with.

Gary


"mttt" wrote in message
...
Been 'sperimenting with resawing and veneering. Resawed some 6" wide, 30"
long 4/4 Jatoba stock into 1/8" slices. Was flat after the cut. Believe
the
stock to be dry - but lack a moisture meter.

Edge glued (Titebond) the veneers together to get a 12" wide, 30" long
sheet. Then a couple of days later, glued (Titebond Extend) the 1/8" thick
veneers to 1/8" thick baltic birch - aiming to end up with a 1/4" thick
door
in the end.

Both panels bowed up - one much more than the other. Bow is cross grain -
across the 12" width for the Jatoba.


When I was experimenting with some 4/4 Maple a week earlier - same sizes,
same thicknesses - the bowing also occurred but with the grain - along the
30" length.

I don't recall whether how I oriented the Baltic Birch panels underneath -
but was thinking since they're more plywood-ish than not, they should be
relativley stable.

Can anyone help me understand (a) what I could have done to prevent the
bowing [e.g was the stock too wet; too thin; wrong glue] and (b) what
might
explain why the Jatoba bowed cross grain and the Maple bowed with grain???

[ Head scratchin'... ]
Thank you!